<template>
  <div>
    <!-- 目标: 把用户选中的数字, 累计求和显示 -->
    <div>
      <span v-for="(item, i) in arr" :key="i">
        <input type="checkbox" name="num" v-model="cArr" :value="item" />
        {{ item }}
      </span>
    </div>
    <p>你选中的元素, 累加的值和为: {{ theSum }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      cArr: [],
    };
  },
  computed: {
    theSum() {
      return this.cArr.reduce((sum, obj) => (sum += obj), 0);
    },
  },
};
</script>

<style>
</style>